The effect of sample viscoelastic properties and cantilever amplitudes on maximum repulsive force, indentation, and energy dissipation in bimodal AFM

Abstract Bimodal atomic force microscopy (AFM) uses two eigenfrequencies to map nanomechanical properties with high spatial and temporal resolution. To reliably surface understand the links between experimental observables, energy dissipation, viscoelastic considering effects of nonconservative interaction forces is essential. avoid damaging sample, maximum tip indentation into sample needs be controlled. In this work, we use both experiments simulations study how affect cantilever response in bimodal AFM. We simulate tip-sample force, indentation, dissipation for samples different viscous properties. Under tested operating conditions, observe that more dissipated higher eigenmode. The larger eigenmode free amplitude increases eigenmodes. contrast AFM map. are cross-compared similar trends observed. This work important understanding optimizing measurements on significant responses, such as cells, tissues, polymers.